Kit that converts the 270 ml wide mouth bottle into an Options bottle. It consists of 1 vent insert, 1 vent tube, 1 travel disc, 1 cap and 1 neck. It brings a change and advantages, such as a new improved venting system, a new teat more similar and all the benefits and the Dr.Brown's guarantee.Also fits 150 ml wide-mouth options bottles. *Colour and design may vary depending on availability.